Business Email Etiquette: 20 Rules Everyone Should Know

Email etiquette can make or break your professional reputation. Here are 20 rules that separate the pros from the amateurs.

1. Use a professional email address - yourname@company.com, not partygirl99@gmail.com
2. Always include a clear subject line - Never send a blank subject
3. Use a proper greeting - "Hi [Name]" or "Dear [Name]" - never "Hey" or "Yo"
4. Get to the point in the first sentence - Don't bury your purpose in paragraph three
5. Keep it short - Aim for 5 sentences or fewer when possible
6. Use proper grammar and spelling - Proofread before hitting send
7. Don't use ALL CAPS - It reads as shouting
8. Be careful with humor and sarcasm - Tone doesn't translate well in text
9. Use "Reply All" sparingly - Does everyone really need to see your response?
10. Don't email angry - Write it, save it as a draft, review it tomorrow
11. Include a professional signature - Name, title, company, phone number
12. Respond within 24 hours - Even if it's just "Got it, I'll get back to you by [date]"
13. Use BCC appropriately - Protect contacts' privacy in group emails
14. Don't overuse exclamation points - One per email maximum
15. Proofread recipient names - Nothing says "I don't care" like misspelling someone's name
16. Use bullet points and white space - Walls of text don't get read
17. Attach files BEFORE writing the email - Avoid the dreaded "see attached" with no attachment
18. Be mindful of time zones - Don't expect an immediate response at 11pm their time
19. Use a clear call to action - Don't make them guess what you need
20. Know when to pick up the phone - Some conversations shouldn't happen over email

The Underlying Principle

Nearly all email etiquette reduces to one idea: reduce the amount of work your message creates for the person receiving it. Clear subject lines, one ask, correct recipients, and a stated next step are not politeness rituals — they are the difference between a message that gets handled and one that gets postponed.

Reply Timing, and What Silence Communicates

You do not owe an instant response. You do owe a predictable one. If a real answer will take several days, send two lines saying so and when. An acknowledgment costs you fifteen seconds and prevents the follow-up email, the second follow-up, and the assumption that you are unreliable.

Reply All, CC, and BCC

• Reply all only when every recipient needs the reply to do something. Otherwise you are creating work for a room.
• CC means "for your awareness." If you need action from someone, put them on the To line and name them in the first sentence.
• BCC for one legitimate purpose — protecting the addresses of a group who do not know each other. Using it to secretly loop in a third party is how trust gets destroyed in one message.

Threads and Subject Lines

Keep one topic per thread. When the conversation genuinely changes subject, start a new thread with a new subject line — future searching depends on it. And never reuse an unrelated old thread just because the address is handy; the subject line is the label the reader trusts.

Attachments and Links

Name files so they make sense in someone else's downloads folder: company, document type, date. Mention the attachment in the body so its absence is noticeable. For anything large, send a link with access already granted — a link that prompts a permission request is the same as no link at all.

Tone Under Pressure

Email strips tone, so neutral reads as cold and terse reads as angry. When a message matters and emotions are involved, write it, do not send it, and reread it in the morning. If a thread has gone back and forth three times without resolution, the medium has failed — pick up the phone and summarize the outcome in writing afterward.

What Not to Put in Email, Ever

• Passwords, card numbers, or full account credentials
• Anything you would not want read aloud in a dispute
• Criticism of a person, where a conversation is possible instead
• Client confidential information sent to the wrong domain — check the address before typing, not after

Small Habits That Compound

• Put the ask in the first two lines, always.
• Use the recipient's name and spell it the way they spell it.
• Break anything over three sentences into short paragraphs or a list.
• State the next step and who owns it before you sign off.
• Set an out-of-office with a real alternate contact, not just an absence notice.
• Use a professional address on your own domain for business correspondence.